:root {
  color-scheme: light;
  --ink: #061724;
  --ink-soft: #173244;
  --paper: #fbfbf7;
  --mist: #eef5f3;
  --line: #d7e2df;
  --teal: #0e908c;
  --teal-dark: #086b73;
  --coral: #e86f51;
  --gold: #d49b3d;
  --white: #ffffff;
  --shadow: 0 18px 48px rgba(6, 23, 36, 0.14);
  font-family: Inter, ui-sans-serif, system-ui, -apple-system, BlinkMacSystemFont, "Segoe UI", sans-serif;
}

* {
  box-sizing: border-box;
}

html {
  scroll-behavior: smooth;
}

body {
  margin: 0;
  background: var(--paper);
  color: var(--ink);
  line-height: 1.6;
}

a {
  color: inherit;
  text-decoration: none;
}

.site-header {
  align-items: center;
  backdrop-filter: blur(18px);
  background: rgba(251, 251, 247, 0.9);
  border-bottom: 1px solid rgba(215, 226, 223, 0.8);
  display: flex;
  gap: 24px;
  justify-content: space-between;
  left: 0;
  padding: 14px clamp(20px, 5vw, 64px);
  position: fixed;
  right: 0;
  top: 0;
  z-index: 20;
}

.brand {
  align-items: center;
  display: flex;
  gap: 12px;
  min-width: 0;
}

.brand-mark {
  align-items: center;
  background: var(--ink);
  border-radius: 8px;
  color: var(--white);
  display: inline-flex;
  font-size: 0.84rem;
  font-weight: 800;
  height: 48px;
  justify-content: center;
  padding: 0 14px;
  width: 96px;
}

.brand strong,
.brand small {
  display: block;
  line-height: 1.2;
}

.brand small {
  color: #5a6e78;
  font-size: 0.78rem;
}

.site-nav {
  align-items: center;
  display: flex;
  gap: 20px;
  font-size: 0.92rem;
  font-weight: 650;
}

.site-nav a {
  color: var(--ink-soft);
}

.site-nav a:hover {
  color: var(--teal-dark);
}

.nav-toggle {
  background: transparent;
  border: 0;
  display: none;
  height: 40px;
  padding: 8px;
  width: 40px;
}

.nav-toggle span {
  background: var(--ink);
  display: block;
  height: 2px;
  margin: 5px 0;
  width: 24px;
}

.hero {
  color: var(--white);
  min-height: 92vh;
  overflow: hidden;
  padding: 140px clamp(20px, 6vw, 84px) 38px;
  position: relative;
}

.hero-image,
.hero-overlay {
  height: 100%;
  inset: 0;
  position: absolute;
  width: 100%;
}

.hero-image {
  object-fit: cover;
  z-index: -2;
}

.hero-overlay {
  background:
    linear-gradient(90deg, rgba(4, 17, 28, 0.86) 0%, rgba(4, 17, 28, 0.72) 38%, rgba(4, 17, 28, 0.24) 78%),
    linear-gradient(180deg, rgba(4, 17, 28, 0.18), rgba(4, 17, 28, 0.72));
  z-index: -1;
}

.hero-content {
  max-width: 850px;
}

.eyebrow,
.section-label,
.status {
  color: var(--gold);
  font-size: 0.78rem;
  font-weight: 800;
  letter-spacing: 0;
  margin: 0 0 12px;
  text-transform: uppercase;
}

h1,
h2,
h3,
p {
  margin-top: 0;
}

h1 {
  font-size: clamp(2.7rem, 7vw, 6.7rem);
  line-height: 0.98;
  margin-bottom: 24px;
  max-width: 980px;
}

.hero-lede {
  color: rgba(255, 255, 255, 0.86);
  font-size: clamp(1.06rem, 2vw, 1.35rem);
  max-width: 720px;
}

.hero-actions,
.hero-stats {
  align-items: center;
  display: flex;
  flex-wrap: wrap;
  gap: 12px;
}

.button {
  align-items: center;
  border-radius: 8px;
  display: inline-flex;
  font-weight: 800;
  justify-content: center;
  min-height: 46px;
  padding: 12px 18px;
}

.button.primary {
  background: var(--coral);
  color: var(--white);
}

.button.secondary {
  border: 1px solid rgba(255, 255, 255, 0.34);
  color: var(--white);
}

.button.light {
  background: var(--white);
  border: 1px solid var(--line);
  color: var(--ink);
}

.button.disabled {
  cursor: default;
  opacity: 0.82;
}

.button.inline {
  margin-top: 10px;
}

.button-row {
  align-items: center;
  display: flex;
  flex-wrap: wrap;
  gap: 12px;
  margin-top: 20px;
}

.hero-stats {
  border-top: 1px solid rgba(255, 255, 255, 0.22);
  gap: 28px;
  margin-top: 80px;
  padding-top: 22px;
}

.hero-stats div {
  min-width: 160px;
}

.hero-stats strong,
.hero-stats span {
  display: block;
}

.hero-stats strong {
  font-size: 1.02rem;
}

.hero-stats span {
  color: rgba(255, 255, 255, 0.7);
  font-size: 0.9rem;
}

.section {
  padding: 88px clamp(20px, 6vw, 84px);
}

.section h2 {
  font-size: clamp(2rem, 4vw, 3.7rem);
  line-height: 1.08;
  margin-bottom: 18px;
  max-width: 840px;
}

.section-heading {
  margin-bottom: 34px;
}

.section-heading.compact {
  margin-bottom: 24px;
}

.intro-grid,
.submission-grid,
.contact {
  display: grid;
  gap: 44px;
  grid-template-columns: minmax(0, 0.82fr) minmax(280px, 1fr);
}

.prose {
  color: #435862;
  font-size: 1.03rem;
}

.cfp-details {
  display: grid;
  gap: 16px;
  margin-top: 28px;
}

.cfp-details article {
  border-left: 3px solid var(--teal);
  padding-left: 18px;
}

.cfp-details h3,
.cfp-topic-columns h3 {
  font-size: 1.12rem;
  line-height: 1.25;
  margin: 0 0 8px;
}

.cfp-details p {
  color: #435862;
  margin-bottom: 10px;
}

.cfp-details p:last-child {
  margin-bottom: 0;
}

.instruction-list {
  display: grid;
  gap: 9px;
  margin: 0;
  padding-left: 20px;
}

.instruction-list li {
  color: #435862;
}

.instruction-list a {
  color: var(--teal-dark);
  font-weight: 850;
  text-decoration: underline;
  text-underline-offset: 3px;
}

.submission-full {
  grid-column: 1 / -1;
}

.muted {
  background: var(--mist);
}

.topic-grid {
  display: grid;
  gap: 16px;
  grid-template-columns: repeat(3, minmax(0, 1fr));
}

.topic-grid article,
.cfp-topic-columns article,
.speaker-list article,
.organizer-grid article,
.date-panel,
.program-card {
  background: var(--white);
  border: 1px solid var(--line);
  border-radius: 8px;
  box-shadow: 0 1px 0 rgba(6, 23, 36, 0.04);
}

.topic-grid article {
  min-height: 220px;
  padding: 24px;
}

.topic-grid span {
  color: var(--coral);
  font-weight: 900;
}

.topic-grid h3,
.speaker-list h3,
.organizer-grid h3 {
  font-size: 1.2rem;
  line-height: 1.2;
  margin: 12px 0 8px;
}

.topic-grid p,
.cfp-topic-columns li,
.speaker-list p,
.organizer-grid p {
  color: #536872;
  margin-bottom: 0;
}

.cfp-topic-columns {
  display: grid;
  gap: 16px;
  grid-template-columns: repeat(3, minmax(0, 1fr));
}

.cfp-topic-columns article {
  padding: 24px;
}

.cfp-topic-columns ul {
  display: grid;
  gap: 8px;
  margin: 14px 0 0;
  padding-left: 20px;
}

.cfp-topic-columns li {
  line-height: 1.45;
}

.speaker-list {
  display: grid;
  gap: 16px;
  grid-template-columns: repeat(2, minmax(0, 1fr));
}

.speaker-list article {
  align-items: center;
  display: grid;
  gap: 18px;
  grid-template-columns: 112px minmax(0, 1fr);
  padding: 22px;
}

.person-photo {
  background: var(--mist);
  border: 1px solid var(--line);
  display: block;
  object-fit: cover;
}

.speaker-photo {
  aspect-ratio: 1;
  border-radius: 8px;
  box-shadow: 0 10px 26px rgba(6, 23, 36, 0.12);
  width: 112px;
}

.avatar {
  align-items: center;
  background: linear-gradient(135deg, var(--teal), var(--coral));
  border-radius: 8px;
  color: var(--white);
  display: flex;
  font-weight: 900;
  height: 62px;
  justify-content: center;
  width: 62px;
}

.status {
  color: var(--teal-dark);
  margin-bottom: 2px;
}

.status.pending {
  color: var(--coral);
}

.affiliation {
  color: #263f4b !important;
  font-weight: 750;
}

.date-panel {
  box-shadow: var(--shadow);
  padding: 26px;
}

.date-panel h3 {
  font-size: 1.4rem;
  margin-bottom: 18px;
}

.date-panel dl {
  display: grid;
  gap: 14px;
  margin: 0;
}

.date-panel div {
  border-top: 1px solid var(--line);
  padding-top: 14px;
}

.date-panel dt {
  color: #536872;
  font-size: 0.9rem;
}

.date-panel dd {
  color: var(--ink);
  font-weight: 850;
  margin: 4px 0 0;
}

.timeline {
  border-left: 3px solid var(--teal);
  display: grid;
  gap: 0;
  margin-left: 8px;
  max-width: 880px;
}

.timeline div {
  display: grid;
  gap: 18px;
  grid-template-columns: 150px minmax(0, 1fr);
  padding: 18px 0 18px 26px;
  position: relative;
}

.timeline div::before {
  background: var(--coral);
  border: 4px solid var(--paper);
  border-radius: 50%;
  content: "";
  height: 13px;
  left: -8px;
  position: absolute;
  top: 25px;
  width: 13px;
}

.timeline time {
  color: var(--teal-dark);
  font-weight: 850;
}

.program-card {
  max-width: 880px;
  padding: 28px;
}

.program-card h3 {
  font-size: 1.3rem;
  margin-bottom: 10px;
}

.program-card p {
  color: #536872;
  margin-bottom: 0;
}

.organizer-grid {
  display: grid;
  gap: 16px;
  grid-template-columns: repeat(3, minmax(0, 1fr));
}

.organizer-grid article {
  padding: 24px;
}

.organizer-photo {
  aspect-ratio: 1;
  border-radius: 8px;
  margin-bottom: 18px;
  width: 128px;
}

.contact {
  align-items: center;
  background: var(--ink);
  color: var(--white);
}

.contact h2 {
  margin-bottom: 0;
}

.contact address {
  border-left: 3px solid var(--coral);
  display: grid;
  font-style: normal;
  gap: 6px;
  padding-left: 22px;
}

.contact a {
  color: #8be5dc;
  font-weight: 800;
}

.site-footer {
  align-items: center;
  background: #031019;
  color: rgba(255, 255, 255, 0.76);
  display: flex;
  flex-wrap: wrap;
  gap: 16px;
  justify-content: space-between;
  padding: 24px clamp(20px, 6vw, 84px);
}

.site-footer p {
  margin: 0;
}

.site-footer a {
  color: #8be5dc;
  font-weight: 800;
}

@media (max-width: 940px) {
  .nav-toggle {
    display: block;
  }

  .site-nav {
    background: var(--paper);
    border-bottom: 1px solid var(--line);
    display: none;
    flex-direction: column;
    left: 0;
    padding: 18px 24px 24px;
    position: absolute;
    right: 0;
    top: 67px;
  }

  .site-nav.open {
    display: flex;
  }

  .hero {
    min-height: 860px;
  }

  .intro-grid,
  .submission-grid,
  .contact,
  .topic-grid,
  .cfp-topic-columns,
  .speaker-list,
  .organizer-grid {
    grid-template-columns: 1fr;
  }
}

@media (max-width: 620px) {
  .site-header {
    padding: 12px 18px;
  }

  .hero {
    min-height: 820px;
    padding: 112px 20px 30px;
  }

  .hero-stats {
    margin-top: 48px;
  }

  .section {
    padding: 64px 20px;
  }

  .timeline div {
    gap: 6px;
    grid-template-columns: 1fr;
  }

  .speaker-list article {
    grid-template-columns: 86px minmax(0, 1fr);
  }

  .speaker-photo {
    width: 86px;
  }

  .avatar {
    height: 86px;
    width: 86px;
  }

  .organizer-photo {
    width: 112px;
  }
}